Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-08-12
Physics
Condensed Matter
Strongly Correlated Electrons
7pages, 5figures
Scientific paper
10.1103/PhysRevB.78.165113
We study the ground state properties of the geometrically frustrated Hubbard model on the anisotropic checkerboard lattice with nearest-neighbor hopping $t$ and next nearest-neighbor hopping $t'$. By using the path-integral renormalization group method, we study the phase diagram in the parameter space of the Hubbard interaction $U$ and the frustration-control parameter $t'/t$. Close examinations of the effective hopping, the double occupancy, the momentum distribution and the spin/charge correlation functions allow us to determine the phase diagram at zero temperature, where the plaquette-singlet insulator emerges besides the antiferromagnetic insulator and the paramagnetic metal. Spin-liquid insulating states without any kind of symmetry breaking cannot be found in our frustrated model.
Kawakami Norio
Koga Akihisa
Yoshioka Takuya
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